Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-70482

CVE-2026-70482HIGH

open-webui open-webui — Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .0057   45.2     —

AFFECTED
  Product     Versions              Fixed
  open-webui  >= 0.8.0, < 0.11.0 –  —

TIMELINE
  Aug 4   Reserved by GitHub_M
  Aug 4   Published (CNA: GitHub_M)
  Sep 18  EXPLOIT PUBLISHED — CVE-2026-70482 (open-webui). Public exploit reference added.
  Sep 18  RESCORED — CVE-2026-70482 (open-webui). CVSS 8.1 → 8.8 (NVD).

CWE-287 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which OAuth client the token was issued to. Anyone holding an access token minted for any client registered with the same provider could exchange it for an Open WebUI session as that token user, including applications the operator does not control and has never authorized. This issue is fixed in 0.11.0.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 4, 2026	Reserved	Reserved by GitHub_M
August 4, 2026	Published	Published (CNA: GitHub_M)
September 18, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-70482 (open-webui). Public exploit reference added.
September 18, 2026	RESCORED	RESCORED — CVE-2026-70482 (open-webui). CVSS 8.1 → 8.8 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.8.0, < 0.11.0	—

Weaknesses

CWE-287

References (4)

https://github.com/open-webui/open-webui/commit/b190dcf3caa00dc8b7b9c7312828298d9143f60d [Patch]
https://github.com/open-webui/open-webui/commit/c4332be71e6e9c314e8a13b9d2819a6932561630 [Patch]
https://github.com/open-webui/open-webui/releases/tag/v0.11.0 [Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-70482 at cve.org

Vendors: open-webui

Weaknesses: CWE-287

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-70482 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.